We investigate the nonlinear pulse propagation through the fiber Bragg grating structure where the pulse dynamics are governed by the nonlinear-coupled mode (NLCM) equations. Using multiple scale analysis, we reduce the NLCM equations into the perturbed nonlinear Schrodinger (PNLS) type equation. To construct the bright and dark Bragg solitons in the upper and lower branches of the dispersion curve, we solve the PNLS equation using the coupled amplitude-phase method.

Senthilnathan K

Department of Physics

School of Advanced Sciences

Vellore Campus

Ramesh Babu P

Porsezian K

Santhanam V.

Fulltext

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Bright and dark Bragg solitons in a fiber Bragg grating

IEEE Journal of Quantum Electronics

In this paper, we generate bright as well as dark soliton type ultrashort laser pulses in a photonic nanowire. The pulse evolution in the photonic nanowire is described by higher order nonlinear Schrödinger equation with an additional effect relating to the nonlinear change of group velocity, which, in turn, is proportional to the field intensity. The pulse evolution equation is solved by coupled amplitude-phase method. Further, we calculate the minimum power required for realizing the ultrashort laser pulses. The main crux of this work stems from the generation of ultrashort pulses by an entirely new nonlinear effect involving change of group velocity.

2012 International Conference on Optical Engineering (ICOE)

Generation of bright and dark solitons in photonic nanowire

We consider an optical pulse propagation in a one-dimensional nonlinear periodic structure doped uniformly with inhomogeneously broadening two-level atoms wherein the pulse propagation is governed by the nonlinear coupled mode-Maxwell Bloch equations. We investigate the pulse-train like periodic waves as well as bright and dark solitons near the photonic bandgap structure under the influence of self-induced transparency (SIT) effect. Further, we demonstrate that the resulting bright and dark SIT Bragg solitons may be realized both in anomalous and normal dispersion regimes, and this novel concept is ultimately the crux of this paper.

Optics and Photonics Letters

SELF-INDUCED TRANSPARENCY BRAGG SOLITONS IN A NONLINEAR PHOTONIC BANDGAP STRUCTURE

Manganese <a href="https://www.sciencedirect.com/topics/physics-and-astronomy/sulfides">sulfide</a> and Cu-doped manganese sulfide <a href="https://www.sciencedirect.com/topics/physics-and-astronomy/nanocrystals">nanocrystals</a> have been synthesized by wet chemical technique. The structural, optical, electrical and <a href="https://www.sciencedirect.com/topics/physics-and-astronomy/magnetic-properties">magnetic properties</a> of as-synthesized nanocrystals have been investigated. The average <a href="https://www.sciencedirect.com/topics/physics-and-astronomy/crystallites">crystallite</a> size and lattice strain of the samples have been calculated from powder X-ray <a href="https://www.sciencedirect.com/topics/physics-and-astronomy/diffraction-patterns">diffraction patterns</a> using the Williamson–Hall analysis. The results show that the average crystallite size decreased while both the lattice strain and the dislocation density values increased in the Cu-doped MnS nanocrystals. The <a href="https://www.sciencedirect.com/topics/materials-science/surface-morphology">surface morphology</a> of Cu-doped MnS nanocrystals has lesser particle size than undoped sample and it shows spherical like structures with little agglomeration. The chemical composition of the prepared samples has been obtained from EDAX. It clearly indicates the presence of Cu ions in the MnS lattice. UV–visible <a href="https://www.sciencedirect.com/topics/physics-and-astronomy/spectroscopy">spectroscopy</a> shows a blue shift in the optical band gap with doping. The <a href="https://www.sciencedirect.com/topics/physics-and-astronomy/photoluminescence">photoluminescence</a> spectra on the doped sample show a quenching of the PL intensity due to strain induced by doping. The electrical conduction, <a href="https://www.sciencedirect.com/topics/materials-science/dielectric-material">dielectric</a> and impedance properties of as-synthesized nanocrystals have been investigated in the frequency range 50&nbsp;Hz–5&nbsp;MHz and temperature range 323–473&nbsp;K which are greatly affected by doping with Cu. The vibrating sample <a href="https://www.sciencedirect.com/topics/physics-and-astronomy/magnetometers">magnetometer</a> measurement revealed that the undoped MnS has paramagnetic behavior while the Cu-doped MnS has superparamagnetic behavior. On Cu-doping, the <a href="https://www.sciencedirect.com/topics/physics-and-astronomy/saturation-magnetization">saturation magnetization</a> and remanence increases while the <a href="https://www.sciencedirect.com/topics/physics-and-astronomy/coercivity">coercivity</a> decreases.

Chaos, Solitons & Fractals

Grating solitons near the photonic bandgap of a fiber Bragg grating

Asymptotic Analysis for Periodic Structures

High frequency wave propagation in periodic structures

Lecture Notes in Physics

Optical Solitons

Progress in Optics

Optical solitons in periodic media with resonant and off-resonant nonlinearities

Physical Review E

Transmission regimes of periodic nonlinear optical structures

Chaos: An Interdisciplinary Journal of Nonlinear Science

Optical gap solitons: Past, present, and future; theory and experiments

Journal	Data powered by TypesetIEEE Journal of Quantum Electronics
Publisher	Data powered by TypesetInstitute of Electrical and Electronics Engineers (IEEE)
ISSN	0018-9197
Open Access	Yes